Henan malpractice Construction Engineering Testing Co., Ltd. is a professional testing company, is one of the qualification place in Henan Province since the first detection through examination of business. Business in the Pile qualification qualification, the qualification grade steel, a qualified indoor environment, building energy efficiency testing, subject testing, materials testing, glass curtain wall testing, roads and bridges detection, detection of a number of civil air defense projects testing qualification and testing laboratories. Indoor environment testing requirements can be broadly summarized in five aspects. (1) Representative sampling time, sampling sites and sampling methods must comply with the relevant regulations, the samples collected can reflect the whole truth. (2) the integrity of the main emphasis should complete the implementation of testing programs, which must ensure the integrity and continuity of systematic sampling and measurement data of the number planned. (3) requires comparable between laboratories or in the same laboratory measurement results comparable to each other on the same sample. (4) the degree of accuracy of the measured value in line with the real value. (5) precision measured values ??with good repeatability and reproducibility. Henan malpractice Construction Engineering Testing Co., Ltd. is a professional testing company, is one of the qualification place in Henan Province since the first detection through examination of business. Business in the Pile qualification qualification, the qualification grade steel, a qualified indoor environment, building energy efficiency testing, subject testing, materials testing, glass curtain wall testing, roads and bridges detection, detection of a number of civil air defense projects testing qualification and testing laboratories. (2) solid retention process solids retention methods include packed column retention retention law and media law. ① packed column retention method. With a long 6 ~ 10cm, inner diameter of 3 ~ 5mm of glass or polypropylene plastic tube filled a variety of solid filler. Fangcheng steel detection, gas flow rate through the sample at a constant filling column, because the test substance is absorbed, dissolved or effect occurs when chemical reactions sampling is retained on the filler steel testing, to concentrate the air kind of purpose. Xixia steel sampling evacuation laboratory testing, analytical or eluted by bringing a test substance is released from the packed column separated and then analyzed the test. According to the filler retention action principle, the filler can be divided into adsorption type, distribution type and reaction type three categories. Adsorptive granular adsorbent packed column (such as activated carbon, silica gel, molecular sieves, porous material) having a large surface area, strong adsorption of gas, vapor molecules have a strong adsorption. Surface adsorption, there are two, one is due to intermolecular attraction caused by physical adsorption, the adsorption is weak; the other is due to the residual chemical valence force caused by adsorption, adsorption force is strong. It should be noted that: adsorption capacity, high sampling efficiency, but to desorption difficult. Therefore, the choice of sorbent, it is necessary to consider the efficiency of adsorption, desorption also consider easy. Town square steel detection, malpractice testing organizations (certification), steel malpractice detected by Henan Construction Engineering Testing Co., Ltd.. Henan malpractice Construction Engineering Testing Co., Ltd. (www.hnrsjc.cn) (www.rsgcjc.com) is a leader in Zhengzhou, construction, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. In malpractice detected leadership with the staff warmly welcome all inquiries negotiations to create a better future malpractice detected.